diff --git a/src/GroupRings.jl b/src/GroupRings.jl
index 2f347d9..b4c57ca 100644
--- a/src/GroupRings.jl
+++ b/src/GroupRings.jl
@@ -301,7 +301,7 @@ end
 #
 ###############################################################################
 
-function addeq!(X::GroupRingElem{T}, Y::GroupRingElem{T}) where T
+function addeq!(X::GroupRingElem, Y::GroupRingElem)
    X.coeffs += Y.coeffs
    return X
 end
@@ -310,12 +310,17 @@ function +(X::GroupRingElem{T}, Y::GroupRingElem{T}) where T
    return GroupRingElem(X.coeffs+Y.coeffs, parent(X))
 end
 
-function +(X::GroupRingElem{T}, Y::GroupRingElem{S}) where {T,S}
+function +(X::GroupRingElem{S}, Y::GroupRingElem{T}) where {S, T}
    warn("Adding elements with different coefficient rings, Promoting result to $(promote_type(T,S))")
    return GroupRingElem(X.coeffs+Y.coeffs, parent(X))
 end
 
-(-)(X::GroupRingElem, Y::GroupRingElem) = addeq!((-Y), X)
+-(X::GroupRingElem{T}, Y::GroupRingElem{T}) where T = addeq!((-Y), X)
+
+function -(X::GroupRingElem{S}, Y::GroupRingElem{T}) where {S, T}
+   warn("Adding elements with different coefficient rings, Promoting result to $(promote_type(T,S))")
+   addeq!((-Y), X)
+end
 
 doc"""
     mul!(result::AbstractArray{T},
diff --git a/test/runtests.jl b/test/runtests.jl
index 49e6459..4377e5c 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -165,6 +165,15 @@ using GroupRings
          a = RG(ones(Int, order(G)))
          b = sum((-1)^parity(g)*RG(g) for g in elements(G))
          @test 1/2*(a+b).coeffs == [1.0, 0.0, 1.0, 0.0, 1.0, 0.0]
+
+         a = RG(1) + RG(perm"(2,3)") + RG(perm"(1,2,3)")
+         b = RG(1) - RG(perm"(1,2)(3)") - RG(perm"(1,2,3)")
+
+         @test a - b == RG(perm"(2,3)") + RG(perm"(1,2)(3)") + 2RG(perm"(1,2,3)")
+
+         @test 1//2*2a == a
+         @test a + 2a == (3//1)*a
+         @test 2a - (1//1)*a == a
       end
 
       @testset "Multiplicative structure" begin